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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffa3b4144da8ab4a4fa7e1d44df2c24446f04ddfa7e531357a25ceee1ab214c' 
  AND token = 'Y4T21xedmxiZh2q1g1A8HUPd1rRjk/M5Uid4L7D+i8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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