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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238784840e8ddd03e9980ca6bc87845b312760bd9751286d6a75e8e118bf2980' 
  AND token = 'Pu+JV096jeE3hmwOR/3RStbipxdzraj61UtblS7Bf6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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