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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a628202daac95bf065f6f8c5b974a3b0a232ede27cc50ba8973f5c10f24fea' 
  AND token = 'vIAvW51ZqekClbIeG5Sw7+4ZnIK6jsJbRrOc3fP3jdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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