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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f864f45cbc7b79cab4359c9726532b6473bca38c22c4f0206a5197d0cda266f6' 
  AND token = '4ImYxX0WlGnvPJn8rVdPfgyh3pgwp0J66pJuygbR3Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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