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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ef5d8242acfb936782015f9e26a90af790fff27e570ff749fed15948c38f6d' 
  AND token = 'PBB2dHiRdU4t60y7861PXLF9KqkhX3Lcd0G0EcfBbdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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