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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009baec027eb0332d860ccc75d1d636ad05aba45ad943dc9a35fe3f63c6fb253' 
  AND token = 'gZz7XxMWUD/SqJJ5gWGcWJIrlOV4zfK+Wi9ZI0edeQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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