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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd79a8bca5d4c41dffc8637b5aae31f7d838d29c2326177ab80f966778a703e' 
  AND token = 'Xshf4xQFMcE/oueS2mfcIRha2BFs2wirfPAjMlGpAZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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