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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89fb531ec07f3c535d7e5ea9d6bd47c8c9f3d478fcdff28bd9bacf82ee5e3e4' 
  AND token = 'ylaImTTaLSvdcELkS6DNJ7GnL46CiUBYKB13VIWnh/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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