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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5fc2ef88d45c47bb7d3761c217330aead664228d458db02c08ae0e48cc4ef6' 
  AND token = 'o9P/ampnyK2pkuPLWbkl6v0Dbz+3UxrETPa/IfukO/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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