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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302f3bb61e63a225f282d35f7ff72c0c61b2751b12d17de1a600618b62faf932' 
  AND token = 'l6Bu3XT+v92CBoYRrhpdpt2CfjRqRXWlBNonKvFxPrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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