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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf35d441273579b0ba337f7a3ff13d4f207f39867df689de0595486e29dc4fa' 
  AND token = '0TtPr8mWackh7raxzI66oXAZ0rJjm7uHetQdlFWjDHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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