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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c744e56f69f380e9072c954b0f834758415a800a9c67b728f540ee9a1da6d014' 
  AND token = 'oL61Gh1m6WAVAwGJ/uTj87CBHikhTfVv330OcMyccnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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