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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3ee615a50f6b7a9c020563f5d35db0b93e7f260589cbe8c1aec576fda6eec3' 
  AND token = '5XSEuhL2iKdCHmUzhjp0wXjsEYB+M0GkYaVQGRZicSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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