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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8353526bb99aca5692d98fd4af871e7591c26b6b7c98f86ac317c1a708d8089d' 
  AND token = 'aHojoDv4nnUhm3i8sybwECsda6P2Gf5ewFBcqQMWcys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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