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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae406325bdedd256959e624d1bdee5b5eda4eee10078b5a882309f0937ba0ce' 
  AND token = 'cL3yG7xH/yziK/gK1AJgmhs8Y4N3VblrTFaXqqEgxFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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