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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463c00250dd755b6e9cb9043b6db8e80811cec0642e383f6ee83229c2fb91b46' 
  AND token = 'll9SGE6lhKZcWVDoDE1zCUUaMy+pB7Ofnz160m0F8yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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