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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe7413f1f6ee9f477ecfb0c45620826813dfbf17a98a804c3eb077a6923b59a' 
  AND token = 'eBkJa8Ye9Oo2o/X0foW678tn9rq6P/mNYs81u4TobjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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