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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98de5b1ccbbd21c33e7fd42ea779afd6406c1742f85885c93f629db0125fb59' 
  AND token = 'lGrLaEMTt4VfF7D91tLhbjgnMwB86njOan0Fzt3+uxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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