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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1272fc70554731a6ef73cca9bd254b24a1fed9b2ceff53d1b50958ea57fc873' 
  AND token = 'q1kLoz3HSgLdSsL99AUvR6//WpiAAQSF6kBEVlYI8GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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