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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc796cd9f92673949b72b8e442e10944ed04952d4c079723216b78a21acee59' 
  AND token = '9tZ77wI53Ly9opfLxnrkkEd7Z9B1KV7bpmS9SiafjNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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