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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a8852457026c1daac1c8c57d523e3de512d6cf4dec461e1330deb13e137510' 
  AND token = 'I82b/02se+WV84XDaDC7oLawdRoVWkRbSLRpHuOCaGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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