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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ca99202164519a4b55802cc51abc0266a5d2e48d1b43f492f58d88ca43200b' 
  AND token = 'CkgWM11XJfrQJwPVbysA0LL+aqkXJoayQLw6UnYOzz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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