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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb7258371c16a4e9f7a8a8076593e8c4e279f5c26a6e2714bd2a9f6be22c779' 
  AND token = 'bx7Ul7mxLJeftfacRxrmCeot/Ypps3xSOon3pdrn+rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00437

JSON explain

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