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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69084ed610d3025c91bc6f7562c26fa61098a4d621eb89d46e6f596104cf64ce' 
  AND token = 'zZMj3U9UiCUOhkeJ+/tt2fw8FHfR5ITUfqpKnbQHhXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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