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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a1a16c527086fc6797ee7e1ea92badbb293d0097fa5efb893eca9a434c63ac' 
  AND token = 'IR9c+P5lxqyIxZpgoT/u0SXLUGPHBax97fU3mphIvGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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