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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b6079fc9238eb125076034ef62480781b0e9ad16f6fc6f9fca5217ceafb21f' 
  AND token = 'ZDW2hYA6vx+X7MSdtFz4CMGfGeyb3hyE+ni9gfNc/2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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