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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e6a621e07107251b352063202fe16f8a8fb552c50a2e5d168f89b079965660' 
  AND token = 'sOrCtmFIAOd73hcmf1jo0PYEZ5Dg4kqQb4Dfl2CsDsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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