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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cc05d70cebb74de1365e2bcf22effeda5130b03174346ba3f9babdb7e80ed8' 
  AND token = 'PdUNrByTWVGpQ+tjh0Hh/2OPyI5t0v8v67P3+E5SXCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}