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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b242fc530fef40ac5ef5471cfa2ecdf14846a71f2615f1176c9e2b7509b8720d' 
  AND token = '0mImpur1fqEoRnDZktA/7Xz33mu3g/0bHKOOsIonVXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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