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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f154da5851d87de76d95556ecad506db5cdda482d2a02d8ee11f08630e6c03' 
  AND token = 'jMTm8/YsRj6rW7XNEparmVKDrUWbGj4GKDS0nU3EZ0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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