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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73542b1dcabedaddaa8267e954175cc027b3514683bbe46c1cd1a56c9f4d8f20' 
  AND token = '0xDNqrPbWNjbTE68C63c1+KgfZwH0CK7T/erYHgSGq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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