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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c911b06179381e6b0efa1d43fda46c718046369e3619692dd9ebe183992b96' 
  AND token = 'eRTI7+8Xo4USgYuDv8yOLYBHUX43PgdphK/WV6c7bmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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