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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedc903821d781d5ecfd60c9d135c8a34fbd3f616a4933cf5af0c4a56ae68e0d' 
  AND token = 'LyTzhKdm7I3q3ZHLhpV+4BbSIlsQo+MFePRr2Ma+jNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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