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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4b610f3435b5201c814cc75e06f233e354f74a574bdfcb9227e419c1d562a4' 
  AND token = '3kVi90rP/YoauarRP1yXv7PJvX/YOw3pSL7E/ZhySxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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