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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a3417e7ca8a50a8c0c9eff2406f367d1505928f6ff42c9d40bf932749725e6' 
  AND token = 'OhDr+mZn2lldNfTavOdJcazYddH6O91mSniojtDV5bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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