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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a031fa26d3dc450fc42905ac3c8d9abac533640de41faa9a44521685701a221a' 
  AND token = 'i6qMRQEWrgoCuli0hsY/N9sGQRpXAlf7UnJ+OYaF7D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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