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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c7a659a2ad14628b81ccc081e2a05cd96eba692720f7dab4a3400bdec0cac6' 
  AND token = 'Tp0Xk7/+BQUmEI0P6dU2hG8qifm44Oz1ao+hdmkI9FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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