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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76393baac9ffda22cf653b735126d5de46f38150a4b6aeb95e4a2bcc99d55663' 
  AND token = '4kJoQ5KEvbQRuso2EzU2QrLj9eP1AA50t+qV+0/XzAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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