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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70efc845ffb187113400e0e00f1734076d1ab40323aa5089549aa90576e7d25b' 
  AND token = '0YfmwYU1cUgF+VOzHPCZlF2MP5VxNjL/Fo2KTtHNj6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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