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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27f200fe63b7b01fde44dcb5857897e6e05332f84275511c30320599ffcaf38' 
  AND token = 'x4Fcit7SVBsZMXy/fVq7//U/mzGLy0EAG0befqtVSxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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