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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b62880a69b05c2625d2c3d23ad70748198103650cf71715a48fce5657d5f3b' 
  AND token = 'STq9Sd61xrUQjcb1hbh491tBps6MieUrcF9tNK/KJgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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