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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a62498344f5335c3dacadfb37d06d80f34140c7876b3ab84a6c38a968e24182' 
  AND token = '616PFupGr/rzEN1NrIw8c/CA3+K7QIiKoDvxKqP/z+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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