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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d8418b305c5c1a0bad4ee6af26d1151b3ad75c7c5dc98d59778bc1b5a796af' 
  AND token = 'K3A00k0lg43s2B1s7XgP2Qrpg7QTyB1Ud1lxRUzM4rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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