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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918baecbde75b7e761a2a710e5755edc399b44e498990a180ccd2da0a37468f3' 
  AND token = 'pRnwuNRFGAS2SMKnt3uB5wrCProVhUGnOC11T23jKZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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