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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc0e189ca4995d3f9da47415dc30597834882aa6f422d806ae674f1f3e38504' 
  AND token = 'OyrBJ/4yFGBXO/68dpM437x+jn6unCby+OG+eZBmfxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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