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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20f3211a595cdd402aa5fc1ed03e2747ec213a60076f7eaf62407e471bf5710' 
  AND token = 'OxuIAUhgPW9ZrtFji8Cw4FNYXFnur4eFbiQaJ8itUEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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