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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c595c27fda1f8850e7ddd08028a5ac739e06659ae72049877166656246c133a' 
  AND token = 'lUT5gFtMIw4YV3HNVbQf6cjozgo6Dp9lwv1WnGGoPF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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