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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95dea90447abfbf4277913cb1a3835134d9a072b50c99ab3b1216a8379aaf51' 
  AND token = 'GEzZLE7yclUhNwxEVzixk7g20/cIrCVJWWlq116V35c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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