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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f108fccf08ae65adb6af54651fb48e4e279ef79346b8392f0ef31deea9e95e' 
  AND token = 'UiWklvOwqm3SyTEkI2T+7ROo/TlupQ1uc5vIm/+vAVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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