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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1a3e9f3f5dea99b4cdcbc95ea5b04772925f8e5a2667647fa2ef0ec7a3a2c1' 
  AND token = 'R3J13hxWYUbkXxqcUK7u/VdCB8Sb8CMezNf4njP+msM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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