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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ec8494544805a28a4970b524f66b4d6f302b3aeea4df05b87f52e94b1e34b2' 
  AND token = 'HfNYJIj8QVzB4KqHIAE0S3PKBIrhFyolGy5b4HYc3pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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