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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094a8df4ab232407839b131d9790afb384845a69082f0e19d15dbbaf76def819' 
  AND token = 'ddGNMm35tk8hKoxotQ7lSUR4cw0It3u1J2/bmxj6ujI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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