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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad416dfa113bd2b2fa3700bddd34004f6f609727f2f2a014686badf57345d99' 
  AND token = 'UKPS6Qgp3MZM8fTO3HVB0uQeiG554GZmok6uMDhOrRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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