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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5416edc43a881cef54810ca43120814337ba126d5ab73ac3300ad90e10fdfef' 
  AND token = 'bAEu2HmLB0si1YSXelUBNJvkY/csE6eeCSlX7l2G82I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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